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Activity Related to Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits, beginning balance | $ 13.2 | $ 13.7 | $ 12.9
Additions based on tax positions related to current year | 5.1 | 0.2 | 0.3
Additions for tax positions of prior years |  | 2.9 | 2.6
Reductions for tax positions of prior years | (4.5) | (3.2) | (1.4)
Foreign currency translation | 0.3 |  |
Foreign currency translation |  | (0.4) | (0.7)
Unrecognized tax benefits, ending balance | $ 14.1 | $ 13.2 | $ 13.7

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